Pediatric Airway Emergencies: Croup, Epiglottitis, Foreign Body Aspiration

Pediatric airway emergencies are among the most time-critical situations in emergency medicine. A child with inspiratory stridor, retractions, and increasing respiratory distress triggers stress in everyone involved – and rightly so. The central challenge lies not only in treatment but already in the rapid and correct differentiation: Is it croup, epiglottitis, or foreign body aspiration? Each of these entities has its own clinical profile, a different time course, and requires fundamentally different management. If you know the differences, you can act purposefully – and avoid potentially fatal errors such as oropharyngeal examination in suspected epiglottitis or watchful waiting in complete foreign body obstruction.

Anatomical Features of the Pediatric Airway

Before you dive into the differential diagnosis, it's worth taking a brief look at the anatomy. The pediatric airway differs from the adult airway in several key aspects, and these very differences explain why children are so vulnerable to upper airway obstructions:

• Relatively large tongue in proportion to the oropharynx
• Higher positioned, U-shaped epiglottis (level C2–C3 in infants vs. C4–C5 in adults)
• Narrowest point is subglottic in children (cricoid cartilage), whereas in adults it is at the glottic level
• Small diameter: Just 1 mm of circumferential mucosal swelling reduces the cross-sectional area of an infant's trachea by approximately 75% (Hagen-Poiseuille law: resistance increases by the 4th power as the radius decreases)
• Softer cartilaginous structures that collapse more easily during forceful inspiration

These anatomical characteristics make it clear why a process that causes nothing more than hoarseness in an adult can become a life-threatening airway obstruction in a young child.

Croup (Laryngotracheobronchitis)

Epidemiology and Pathophysiology

Croup is by far the most common upper airway emergency in childhood. It typically affects children between 6 months and 6 years of age, with a peak incidence around 2 years of age. Boys are slightly more commonly affected than girls.

The cause is a viral infection – most commonly parainfluenza viruses (types 1 and 3), less frequently RSV, influenza, or adenoviruses. The resulting inflammation and mucosal swelling affects the subglottic space – precisely the narrowest point of the pediatric airway. The seasonal peak in autumn and winter is characteristic.

Clinical Presentation

The clinical presentation is so characteristic in most cases that the diagnosis is made purely on clinical grounds:

• Barking cough (seal-bark cough) – often described as "like a seal"
• Inspiratory stridor – worsened by agitation and crying
• Hoarseness to the point of aphonia
• Typical nocturnal worsening – often waking the child from sleep
• Prodromal phase with a mild upper respiratory infection over 1–3 days
• Fever usually only low-grade to moderate (≤ 39 °C)

The Westley Croup Score is a well-established tool for severity assessment:

Criterion	0	1	2	3	4–5
Stridor	none	with agitation	at rest	–	–
Retractions	none	mild	moderate	severe	–
Air entry	normal	decreased	markedly decreased	–	–
Cyanosis	none	–	–	–	with agitation / at rest
Level of consciousness	normal	–	–	–	– / altered

A score ≤ 2 is considered mild, 3–7 moderate, and ≥ 8 severe.

Management

The treatment of croup follows a clear stepwise approach:

1. General measures: Calm the child, keep them on the parent's lap, avoid agitation (any agitation worsens the stridor). Cool, humidified air may empirically help, although the evidence is limited.

2. Corticosteroids – the cornerstone of therapy at every severity level:

   • Dexamethasone 0.15–0.6 mg/kg PO (single dose) – most commonly 0.6 mg/kg, max. 10 mg
   • Alternatively: Prednisolone 1–2 mg/kg PO
   • Onset of action after 1–2 hours, duration 24–72 hours
   • Even in mild croup, dexamethasone reduces the rate of return visits

3. Nebulized epinephrine for moderate to severe croup:

   • Epinephrine 1:1000 (1 mg/mL): 0.5 mL/kg (max. 5 mL) via nebulizer
   • Onset of action within minutes
   • Caution: Rebound effect possible after 1–2 hours → observation period of at least 2–4 hours after administration

4. Oxygen: Only if SpO₂ < 92%, administered without distressing the child if possible (blow-by technique)

5. Intubation: Only necessary in extreme cases, using a tube 0.5–1 mm smaller than age-calculated size

Key point: Antibiotics have no role in the management of croup.

Epiglottitis

Epidemiology and Pathophysiology

Acute epiglottitis has become dramatically less common since the introduction of the Haemophilus influenzae type b (Hib) vaccine into national immunization programs. Nevertheless, it continues to occur – in unvaccinated children, vaccine failures, and increasingly in adults. The classic age peak is between 2 and 7 years.

The cause is a bacterial infection of the epiglottis and supraglottic structures. In addition to Hib, streptococci, Staphylococcus aureus, and other pathogens may be involved. The epiglottis becomes massively swollen (classic "cherry-red" appearance) and can completely obstruct the airway.

Clinical Presentation

Epiglottitis differs markedly from croup in its clinical presentation – and recognizing this distinction can be lifesaving:

• Peracute onset – deterioration within hours, not days
• High fever > 39 °C, severely ill appearance, toxic presentation
• Dysphagia and drooling (the child cannot or will not swallow)
• Muffled, quiet voice – but no barking cough
• Inspiratory stridor – often quieter than in croup because the child breathes shallowly and cautiously
• Tripod position: The child sits upright, leaning forward, supporting themselves with their arms, mouth open, chin thrust forward – instinctively to maximize airway patency
• Anxiety and restlessness with preserved consciousness

Diagnostic Warning

Never inspect the oropharynx! In suspected epiglottitis, any manipulation – tongue depressor examination, throat swab, placing an IV in an agitated child – can provoke complete airway obstruction. The diagnosis is made clinically. If imaging is considered (which is rarely indicated in the acute setting), a lateral soft tissue neck X-ray will show the classic thumbprint sign (thumb-shaped thickening of the epiglottis).

Management

Epiglottitis is a true emergency with a potentially fatal course. Management follows clear priorities:

1. Do not agitate the child! Keep them on the parent's lap, no painful procedures
2. Oxygen cautiously via blow-by technique
3. Immediate airway management by the most experienced intubator available – ideally in the operating room under controlled conditions:
   • Inhalational induction with sevoflurane maintaining spontaneous ventilation
   • Oral intubation, tube 0.5–1 mm smaller than calculated
   • Surgical airway (cricothyrotomy) must be available as a backup
4. Antibiotic therapy after airway is secured:
   • Ceftriaxone 80–100 mg/kg/day IV (max. 4 g) or
   • Cefotaxime 150–200 mg/kg/day IV in 3 divided doses
   • Adjustment according to culture and sensitivity results
5. Intensive care monitoring until safe resolution of swelling (extubation usually after 24–72 hours)

Foreign Body Aspiration

Epidemiology and Risk Profile

Foreign body aspiration is one of the most common causes of accidental death in children under 5 years of age. The peak incidence is between 1 and 3 years – the age at which children explore their environment orally but have not yet developed mature coordination of chewing and swallowing.

Commonly aspirated objects include:

• Foods: Nuts, grapes, carrots, popcorn, hard candy, hot dog pieces
• Small toy parts, coins, button batteries, marbles

Anatomically, foreign bodies in children land approximately equally in the right and left main bronchi (unlike in adults, where the right bronchus is preferentially affected due to its steeper angle of descent).

Clinical Presentation

The presentation depends critically on the size, shape, location, and degree of obstruction caused by the foreign body:

Acute phase (aspiration event):

• Sudden choking, gagging, respiratory distress – often in a previously completely healthy child
• No prodromal phase, no fever at onset
• Witness accounts of the aspiration event are diagnostically crucial

Supraglottic/laryngeal foreign body (rare but dangerous):

• Complete or high-grade obstruction
• Stridor, aphonia, rapid cyanosis
• Potentially fatal within minutes

Tracheal foreign body:

• Biphasic stridor (inspiratory and expiratory)
• Palpatory tracheal thud (audible slap, palpatory thud)

Bronchial foreign body:

• Unilateral wheezing, unilaterally decreased breath sounds
• Potentially an initially asymptomatic phase after the acute event
• Delayed diagnosis after days to weeks with recurrent pneumonias is possible

AHA Decision Algorithm

The AHA guidelines clearly differentiate between effective cough and ineffective cough as well as conscious and unconscious child:

With effective cough (child is coughing forcefully, breathing between coughs):

• Encourage continued coughing
• No back blows or Heimlich maneuver – these may push the foreign body deeper
• Close observation

With ineffective cough / severe obstruction in a conscious child:

Infant (< 1 year):

1. 5 back blows: Child prone on the forearm, head lower than trunk, firm blows with the heel of the hand between the shoulder blades
2. 5 chest thrusts: Turn the child over, supine on the forearm, compressions as for CPR (lower third of the sternum, two fingers)
3. Repeat the sequence until the foreign body is dislodged or the child becomes unconscious

Child (> 1 year):

1. 5 back blows
2. 5 abdominal thrusts (Heimlich maneuver): Standing behind the child, fist placed between the navel and xiphoid process, sharp inward and upward thrusts
3. Repeat the sequence

If the child becomes unconscious:

• Begin CPR (30:2 with one rescuer, 15:2 with two healthcare providers)
• Before each ventilation: inspect the mouth, remove only visible foreign bodies
• No blind finger sweeps!
• Call for emergency services (if not already done)

Imaging

• Chest X-ray (AP and lateral) in suspected bronchial foreign body: hyperinflation, mediastinal shift, atelectasis – however, most aspirated foreign bodies (food items!) are radiolucent
• Inspiratory/expiratory films or fluoroscopy to demonstrate a ball-valve mechanism
• Bronchoscopy: Gold standard for diagnosis and treatment – rigid bronchoscopy performed by experienced pediatric surgeons or pediatric pulmonologists

Differential Diagnostic Comparison

The following table summarizes the three entities in direct comparison:

Feature	Croup	Epiglottitis	Foreign Body Aspiration
Age	6 mo – 6 y (peak: 2 y)	2–7 y	1–3 y
Onset	Gradual (hours)	Peracute (hours)	Sudden (seconds)
Fever	Low-grade to moderate	High (> 39 °C)	None
Cough	Barking	Absent/minimal	Paroxysmal cough
Voice	Hoarse	Muffled, quiet	Normal (with bronchial FB)
Drooling	No	Yes (pronounced)	No
Body position	Unremarkable	Tripod position	Variable
Stridor	Inspiratory	Inspiratory (quiet)	Variable, possibly unilateral
History	Viral infection	Acute illness	Aspiration event
Oropharyngeal exam	Possible (unremarkable)	Contraindicated!	Only if FB is visible
Initial management	Dexamethasone, ± nebulized epinephrine	Airway management + antibiotics	Back blows/Heimlich maneuver

Additional Differential Diagnoses

Besides the three main entities, you should keep the following diagnoses in mind:

• Bacterial tracheitis: Toxic-appearing child, high fever, membranous secretions, poor response to croup therapy – often secondary to viral laryngotracheitis
• Retropharyngeal/parapharyngeal abscess: Fever, neck stiffness, dysphagia, torticollis, drooling
• Allergic angioedema: Acute swelling of lips, tongue, uvula – signs of anaphylaxis?
• Congenital anomalies: Laryngomalacia (chronic stridor in infants), vascular ring, subglottic stenosis

Clinical Pearls

• Stridor that is becoming quieter is a warning sign – it indicates not improvement, but exhaustion and impending decompensation.
• SpO₂ drops late in upper airway obstruction – a normal SpO₂ does not rule out critical obstruction.
• Parents are the best diagnosticians: The question "Could the child have aspirated something?" must be asked with every acute stridor without signs of infection.
• Avoid agitation: A crying child has higher oxygen consumption and worse stridor. All invasive measures should only be performed after clear indication.
• Dexamethasone does not work for foreign body aspiration – if a child with stridor does not respond to corticosteroids, reconsider the diagnosis.

Practical Training

Correct differentiation and algorithmic management of pediatric airway emergencies require more than theoretical knowledge. Especially foreign body maneuvers in infants, the decision to secure the airway in epiglottitis, and team management in pediatric emergencies benefit enormously from regular, hands-on simulation training. In the PALS (Pediatric Advanced Life Support) course by Simulation Tirol, you train these scenarios systematically and according to American Heart Association algorithms – with realistic simulation manikins, structured debriefing, and a focus on what matters in a real emergency: rapid decisions and confident actions.